• Full Prof. Jul. 2020-present, National Univ. of Singapore, Singapore.
• Associate Prof. with tenure, Jan. 2007-Jul., 2020, National Univ. of Singapore, Singapore
• Visiting Fellow, Aug., 2011-June 22, 2012. Princeton University, USA
• Assistant Prof., Oct. 2000-Dec. 2006, National Univ. of Singapore, Singapore.
• Visiting Assistant Prof., Nov. 2004-Dec. 2005, Department of Biostatistics and Computational Biology, University of Rochester, USA.
• Visiting Assistant Professor, Nov. 2003-Jan. 2004, Department of Biostatistics and Computational Biology, University of Rochester, USA.
• Postdoctoral Fellow, Sept. 1999-Oct. 2000, CBAR, Harvard School Public Health and Frontier Science & Tech. Research Foundation, Boston, USA.
• Research Follow, Dec. 1991-Jan. 1992, Hong Kong Baptist College, Hong Kong.
• Research Follow, April 1991-Sept. 1994, Academia Sinica, Beijing, China.